Spark-timing apparatus.



No. 882,888. I RATRNTRD MAR. 24, 1988.

o. c. DODGE. l SPARK TIMING APPARATUS.

APPLICATION FILED NOV. 29, 1905.

,UNrTED entras Pair-ENT oFFroE.

CHRLES C. DODGE., OF WOLLASTON, MASSACHUSETTS, ASSIGNOR TO THE DDGE LUBRlCA'lOR COMPANY, 01C BOSTUN, MASSACHUSETTS,

MASSACHUSETTS.

A 'CORPORATION 0F SPARK-TIMING APPARATUS.

Yatented March 24, 190B.

Application led November 29, 1906. Seria No. 289,617.

To all whom it may concern.'

Be it known that I, CHARLES Ci Denon, of Wollaston, in the county'of Norfolk and State of Massachusetts', have invented certain new and. useful Improvements in Spark- Tirning Apparatus, of which the followinpr is a s eclfication.

his invention has relation to spark timing apparatus lfor employment in connection with the spark plug circuits of internal combustion engines, and has for its object to pro'- videfcertain improvements therein which are illustrated upon 'the accompanying drawings and described in the following speci'lication and ointed out with particularity in the appen ed claims.

Referringr to the accompanying drawings- Figure l represents in plan view and with the screwed therein.

Wood pulppor any other substance which is a 'good nonconductor of electricity.

Through an aperture in the bottom of the casing extends a bushing c which is preferably ol Ine/tal which constitutesia journal for a ro tatable arbor d. This arbor is formed with an enlarged socket at the end for the reception of a shalt by which rotary movement may be imparted to the arbor. The arbor and the shaft are secured together by any suitable. means, such as a screw c. To the arbor is attached a movable contact which is adapted to be engaged successively with one or more stationary contacts l'or the purpose of closing the circuit through one or more spark plugs". 'lhe stationary contacts may conveniently take the forni of boltsfhaving circular Ifiat heads f, said bolts being passed outwardly through the bottom wall of the casing, and the heads being embedded in the casing so that theI upper surfaces ol the heads are Vflush with the upper surfaces of Said bottom wall, as clearly shown in Fig. 2. 'l`he bolts are securely held in place. by washers f2 and nuts f. Nuts j" are utilized for securing to the bolts the ends of conductors g, which form portions of the spark plug circuits, Thus the bolts consist of combined stationary contacts and binding screws. Any suitable number of these stationary contacts may be utilized, their number being dependent upon the number of spark plugs through which it is desired to pass acu entot electricity for the purpose of forming a spark. The contacts are arranged at the same radial distance from the axis of the arbor (l and are syn'nnetrioally placed within the casing.

The movable contact consists of a roll h which is jlour'naled on an arm radiating from the arbor. Said arm comprises a bolt h and a yoke tinto which it is passed and which is secured in place by a nut h2. The yoke is in turn pivoted upon a pin j.vvhich is passed transversely' through the end of' the arbor d which extends into the casing'. The4 rotation of the arbor d atfeets a vcircular or rev'- olubie movement of the roller h so that it is caused to engage successively the eontactsf". 'lo insure aproper engagement of the contarts /t and f, a spring' is passed through the arbor d and through the )in y' and its tree end rests upon the free cnil of ythe yoke. 'lhe spring thus serves to hold theroller or movable, contact' t yieldingly against the bottom wall of the casing or support and' an arm o radiating therefrom and having connected to it a link (L2 leading' to the suiti able lever (not shown) which is adapted to be moved b v the operator for the purpose of rotatably shifting the easing. The shaft e`\ is operated bv any suitable mechanism for an element which is actuated by an engine.

The roll Ilzy is ot' such width that as it engages the flat statiiiary contactsjf, portions oi' the periphery oi' the roll havea sliding contact with the exposed faces of said contacts, due to the tact that the. roll h is traveling in a circular path. 'lhns I not only secure a su'llieientiy positive sliding;r engagement ofthe contacts to insure a closing of the circuit through the spark plug, but at the same time i eliminate much lofthe friction and theretore reduce the wear of the parts.

lt will be understood that the spark plug circuits include in addition to the stationary contacts, the shaft e, arbor d, the yoke i and the roll h.

v Having thus explained the nature of thev -rotatable cylindrical contact on the end of said arbor adapted to roll over said stationary contact or contacts in its rotation.

2. A spark lifuing device comprising a casing 'formed of insulating material and having a flat surface, one'or more contacts on said casing having their faces flush with the fiat surface of the easing, an arbor per pendicular to said surface, an arm on said arbor, and a movable cont-act comprising a cylindrical roll journaled on the end 'of said arm on an axis longitudinal of said arm and adapted to roll over said stationary contact or contacts, substantially as described.

3. A spark timing device comprising a casing formed of insulating material, stationar)r contacts secured to said easing and having their faces located in the same plane,

an arbor perpendicular to said plane, an arm same plane, an arbor, an arm pivoted to said arbor, a roll journaled on the end of said arm, and a spring bearing against the free end of said arm, substantially as described.

5. A spark timing device comprising a casing formed of insulating material and having a flat surface, a cover for closing said casing, an arbor extending into said casing, a yoke in said casing pivotcd upon the end of the arbor, a movable contact consisting of a roll journaled upon the free4 end ol said arm, stationaryr contacts consisting of lat 4headed bolts passed through said casing and having their heads substantiallyv ilush with said fiat surface, and means onthey ends ol' said bolts tor securing electrical conductors thereto.

In testimon)r whereof .l have allixed my signature, in presence of two witnesses.

` CHARLES C. DODGE.

Witnesses:

M. B. MAY, C. C. S'rnonnn. 

